Roofing material

Abstract

Method to produce a roofing membrane for use in the construction of roofs which comprises mating of at least two plys of fiberglass scrim fabric to form a substrate for the roofing membrane. At least one of the plys of the substrate is a triaxially wound scrim fabric to provide additional strength to a standard open mesh rectangular formed scrim fabric.

I claim: 
     
       1. A roofing membrane comprising: a first fiberglass scrim fabric mated with a second fiberglass scrim fabric and a layer of bituminous material saturated through and on both the outside surfaces of said first and second scrim fabrics, said second scrim fabric being triaxially wound. 
     
     
       2. The membrane of claim 1 wherein said first scrim fabric is formed to have a plurality of rectangular areas between the warp and weft yarn of the fabric. 
     
     
       3. The membrane of claim 1 wherein said first and said second scrim fabrics are nonwoven. wherein said second scrim   
     
     
       4. The membrane of claim 1 wherein said second scrim fabric has a sheet of nonwoven mat material adhered to said fabric adjacent the outer layer of bituminous material. 
     
     
       5. The membrane of claim 4 wherein said first scrim fabric is formed to have a plurality of rectangular areas between the warp and weft yarns of the fabric. 
     
     
       6. The membrane of claim 5 wherein said first and said second scrim fabrics are nonwoven.